Motor control circuit for pad holder

ABSTRACT

A writing pad holder is disclosed which incorporates an automatic feed control mechanism for feeding a length of pad from its roll, said mechanism including an electrical switch operable to start and stop a drive motor, said switch being associated with a switching gear and adapted to close during a full cycle of revolution of the switching gear.

United States Patent [151 3,641,412 Hayashi Feb. 8, 1972 [54] MOTORCONTROL CIRCUIT FOR PAD [56] References Cited HOLDER UNITED STATESPATENTS [72] Invenm" Hayash" Japan 3,101,913 8/1963 Davis ..226/134 x[73] Assignee: Hayashi Seisakusho C0,, Ltd., Sumida-ku, 3,277,35610/1966 Kraft et al ..318/466 X Tokyo, Japan 3,381,867 5/1968 Konel..318/470 X [22] Filed: 1970 Primary Examiner-Benjamin Dobeck [21] Appl.No.: 84,669 AttorneyNolte and Nolte {57] ABSTRACT [30] ForeignApplication Priority Data A writing pad holder is disclosed whichincorporates an auto- June 15, 1970 Japan ..45/59334 matic feed comm]mechanism for feeding a length of pad from its roll, said mechanismincluding an electrical switch operable [52] US. CL ..3l8/470, 226/ 134to Start and Stop a drive motor, Said Switch being associated [51] Int.Cl. ..G05d 3/06 with a switching gear and adapted to dose during a f llcyde [58] Field of Search ..318/466, 468, 470; 226/134, f revolution fthSwitching 4 Claims, 6 Drawing Figures PATENTEDFEB 8 I972 3.641.412

SHEET 1 Bl" 3 I NVEN TOR.

BY CHUSAKU HAYASHI Mac la/W Mnlzmsys PATENTEU FEB 8 I972 SHEET 2 BF 3 INVEN TOR.

BY CHUSAKU HAYASHI had? M1 Mu M! o nlvny PAIENTEBFEBa m2 3.641.412

sum 3 or 3 INVENTOR.

BY CHUSAKU 'HAYASHI www HTT RA/EYEI MOTOR CONTROL CIRCUIT FOR PAD HOLDERThis invention relates to a stationary device and more particularly to amemorandum pad holder of the type including an automatic feed controlmechanism for feeding a predetermined length of pad at a time from aroll of paper.

The present invention has for its object to provide a new, useful deviceof the class described which is simple in con struction and accurate inperformance.

This object and features of the invention will be better understood fromthe following description taken in connection with the accompanyingdrawings which illustrate a preferred embodiment and in which drawings:

FIG. 1 is a perspective view of a memorandum pad holder embodying theinvention; 2

FIG. 2 is a longitudinal cross-sectional view of the same;

FlG. 3 is a plan view of part of the holder;

FIG. 4 is a cross-sectional view taken on the line IVlV of FIG. 3illustrating a drive transmission mechanism employed for feeding a pad;

FIG. 5 is a cross-sectional view of part of the transmission mechanismtaken on the line V-V of FIG. 4; and

FIG. 6 is a schematic view utilized to explain the electricalconnections of the automatic feed mechanism.

Referring to FIGS. 1 and 2, there is shown a memorandum pad holder 10which generally comprises a casing 11 provided with a pair of opposingsupport arms 12 projecting rearwardly of the casing and adapted tosupport a winding shaft 13 rotatably therebetween, which shaft has woundthereon a roll of writing pad 14. The casing 11 has removably connectedthereto a writing bed 15 which is slightly tilted downwards toward oneend of the holder and which has a rise portion 15' at the opposite end.An enlarged compartment 16 is formed in the interior of the casing 11 bythe rise portion 15' of the bed 15, sidewalls 17, rear wall 18 bottomwall 19 of the casing and adapted to accommodate therein a motor driveand its associated transmission mechanism as shown in FIG. 4 anddescribed hereinafter. A support member 20 is secured to the bottom 19of the casing 11 and has two opposed projections 20 for connecting apressure plate 21 pivotally thereon. The support member 20 further hasinternal therewith a pad guide 21' extending between the rear wall 18and the lower end of the rise portion 15' of the bed 15.

A feed roller 22 which may be made of for example rubber, is fixedlymounted on the shaft 23 which is joumaled in suita ble bearings betweenthe sides of the support member 20. There is provided a spring 24 fornormally urging the pressure plate 21 into frictional engagement withthe feed roller 22, so that rotation of the roller 22 frictionally feedsthe pad 14 to the writing bed 15. The pad 14 is passed through anopening 25 in the rear wall 18, between pressure plate 21 and feedroller 22, along the guide member 21 and through another opening 26 ontothe bed 15 as seen in FIG. 2.

A drive and transmission mechanism employed according to the inventionfor effecting rotation of the feed roller 22 comprises a motor M, afirst transmission gear assembly 27 coupled to the motor and including alarge gear 27 and a small gear 27" coaxially mounted on a shaft 28, anda second transmission gear assembly 29 driven by the first gear assemblyand including a large gear 29' and a small gear 29" coaxially mounted ona shaft 30 coupled to the feed roller shaft 23. As seen in FIG. 4, thelarge gear 27' of the first assembly 27 is in driven engagement with thedrive gear of the motor M and the small gear 27" is meshed with thelarge gear 29' of the second assembly 29. The transmission mechanismfurther includes a switching gear 31 rotatable on its shaft 32' anddisposed in meshing engagement with the small gear 29" of the secondtransmission gear assembly 29. The switching gear 31 has a predeterminedgear ratio related to the small gear 29" such that a revolution of thegear 31 determines the length of the pad 14 to be fed.

As shown in FIG. 5, the switching gear 31 is provided on one sidethereof with an electrically conductive disc plate 32 and anelectrically nonconductive or insulating disc plate 33 interposedbetween the switching gear 31 and the conductive disc plate 32. Theconductive disc plate 32 is provided with a cutaway recess 34 throughwhich recess part of the insulating disc 33 is exposed for contact witha contact strip 35 extending from the motor frame 36.

There is provided a switching element 37 such as of a resilient metalsecured on the top of the motor frame 36 and disposed in abuttingrelation to and normally urging a pushbutton 38 into its upward positionas shown in FIG. 4. Depressing this pushbutton brings the element 37into contact with a projection 39 extending upright from the motor frame36, whereupon the motor circuit is closed to start the motor M. Thus,starting the motor M drives the various transmission gears alreadydescribed including the switching gear 31 and causes the contact strip35 to be released from the recess 34, hence from the insulator 33, andto come into contact with the conductive disc 32. The motor energizationcircuit is arranged so that it closes upon engagement of the contactstrip 35 with the conductive disc 32 and opens when the contact strip 35is disengaged from the conductive disc 32 and engaged with the insulator33 exposed through the recess 34. Accordingly, the motor M is keptenergized as long as the contact strip 35 remains in contact with theconductive disc 32, even with the pushbutton 38 released. In otherwords, the duration of energization of the motor M corresponds to thetime required for the switching gear 31 to complete a substantially fullcycle of revolution. This arrangement is schematically illustrated inFIG. 6 wherein the contact elements 37 and 39 associated with thepushbutton 38 form a first switch to open and close the motor circuit,and the contact elements 35 and 32 form a second similar switch inparallel to the first switch. The first switch is actuated upondepression of the pushbutton 38 to start the motor M, whereupon theswitching gear 31 begins to rotate clockwise in mesh with the small gear29" of the second gear assembly 29 which in turn rotates the feed roller29 counterclockwise to feed the pad 14. Simultaneously as the switchinggear 31 rotates, the contact strip 35 engages with the conductive disc32 to hold the motor M in its energized state. This permits thepushbutton 38 to be released immediately after it is depressed.

It will be appreciated that the length of the pad 14 desired to be fedat a time may be determined by the gear ratio of the switching gear 31related to the small gear 29" of the second transmission gear assembly.

Designated at 40 is a battery connected to the motor M, and at 41 is apad retainer which may be, if desired, provided with a cutting edge forcutting the pad 14 therealong.

Having thus described the invention, it will be understood that theinvention is not to be limited to the specific form and constructionherein advanced, but various changes and modifications may be madetherein without departing from the spirit and scope of the appendedclaims.

What is claimed is:

1. A memorandum pad holder including an automatic fecd control mechanismwhich comprises a feed roller disposed in frictional engagement with apressure plate for feeding a writing pad therebetween, a motor fordriving said roller, a first transmission gear assembly coupled to saidmotor and having a large and a small gear, a second transmission gearassembly operatively associated with said first assembly and having alarge and a small gear, a switching gear engaged with said small gear ofthe second assembly and having an electrically conductive area and aninsulating area, a first switching circuit, and a second switchingcircuit parallel thereto, said second switching circuit including acontact strip disposed in abutting relation to said areas of theswitching gear, whereby the motor is energized when said contact stripengages said conductive area and deenergized when said contact stripengages said insulating area.

2. The device as defined in claim 1 wherein said first switching circuitis operatively associated with a pushbutton for opening and closing themotor energization circuit.

and an electrically insulating disc member interposed between said gearand said conductive disc member, said conductive disc member having arecess through which to expose part of said insulating disc member forengagement with said contact strip.

1. A memorandum pad holder including an automatic feed control mechanismwhich comprises a feed roller disposed in frictional engagement with apressure plate for feeding a writing pad therebetween, a motor fordriving said roller, a first transmission gear assembly coupled to saidmotor and having a large and a small gear, a second transmission gearassembly operatively associated with said first assembly and having alarge and a small gear, a switching gear engaged with said small gear ofthe second assembly and having an electrically conductive area and aninsulating area, a first switching circuit, and a second switchingcircuit parallel thereto, said second switching circuit including acontact strip disposed in abutting relation to said areas of theswitching gear, whereby the motor is energized when said contact stripengages said conductive area and deenergized when said contact stripengages said insulating area.
 2. The device as defined in claim 1wherein said first switching circuit is operatively associated with apushbutton for opening and closing the motor energization circuit. 3.The device as defined in claim 1 wherein said switching gear has apredetermined gear ratio related to said small gear of the secondassembly which ratio determines the length of the writing pad to be fed.4. The device as defined in claim 1 wherein said switching gear furtherincludes an electrically conductive disc member and an electricallyinsulating disc member interposed between said gear and said conductivedisc member, said conductive disc member having a recess through whichto expose part of said insulating disc member for engagement with saidcontact strip.